Product Manual

Contents of the Humidity Calibration Kit

» Two jars with color-coded salt chamber labels, plastic spacer grids and sealing lids

» One jar with no spacer grid (for water)

» One vial with magnesium chloride (MgCl) salt and blue color-coded label

» One vial with sodium chloride salt (NaCl)and red color-coded label

» One RH Calibration Kit insulated bag/carry case

» One color-coded labeled measuring cup

Note: Our calibration process has changed. The changes will require more time but will improve relative

humidity calibration accuracy vs. the previous method. Please familiarize yourself with the new process.

Note: Only place one Kestrel unit in each calibration jar at a time. Attempting to calibrate more than one

unit in each jar at the same time will reduce RH calibration accuracy. If you are attempting to calibrate

multiple units the process can be overlapped so that while the rst Kestrel unit is equilibrating in the

second jar, the second Kestrel unit can begin equilibrating in the rst jar.

Note: We have found that when using this Kestrel Relative Humidity Calibration Kit, setting the second

calibration point to 74.0% RH rather than 75.3% as previously recommended produces a more accurate

calibration. This value is specic to calibrating with this kit. If a dierent method is used for generating a

reference RH for calibration, the expected RH value for that method should be used.